KR20160021496A - Combustion apparatus having flame rod measuring flame current - Google Patents
Combustion apparatus having flame rod measuring flame current Download PDFInfo
- Publication number
- KR20160021496A KR20160021496A KR1020140106776A KR20140106776A KR20160021496A KR 20160021496 A KR20160021496 A KR 20160021496A KR 1020140106776 A KR1020140106776 A KR 1020140106776A KR 20140106776 A KR20140106776 A KR 20140106776A KR 20160021496 A KR20160021496 A KR 20160021496A
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- Prior art keywords
- flame
- current value
- gas
- load
- burner
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Combustion (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
An object of the present invention is to provide a combustion device and a control method for rapidly varying a state of a flame and controlling an excess air ratio to thereby measure a flame current that minimizes the emission of pollutants, thereby varying a gas supply amount. In order to achieve this, a combustion apparatus of the present invention includes: a burner; A blower for supplying air to the burner; A gas supply unit for supplying gas to the burner together with the air; A flame rod for measuring a current of the flame generated in the burner; And comparing the detected current value detected by the flame load with a preset reference current value to change a gas supply amount in the gas supply unit when the detected current value deviates from the deviation of the reference current value, And outputting a control signal so as to be within a deviation range of the current value.
Description
BACKGROUND OF THE
Generally, a gas boiler is a burner used to burn fuel gas, and there is a premixed burner that pre-mixes air and combustion gases and then burns premixed air and combustion gases.
The conventional gas boiler includes a blower for sucking outside air, a supply pipe for supplying the air introduced by the blower to the burner, a gas valve for supplying gas from the gas supply source by the pressure difference generated by the blower, A burner for burning a mixer in which the air and the gas are mixed to form a flame, and a control unit for controlling the combustion according to the respective constitutions.
In this case, the load of the burner is determined by the amount of combustible gas and the air-fuel mixture ratio (excess air ratio,?) Between gas and air.
The amount of such gas is determined by the gas valve, which uses a pneumatic gas control valve, which is a way in which the amount of gas supplied is varied by the pressure difference generated by the blower.
The pneumatic gas control valve is set such that the amount of gas corresponding to the maximum load required for the gas boiler is supplied in the process of manufacturing the gas boiler, and the user can not arbitrarily adjust the gas boiler during use.
On the other hand, premixed gas boilers are increasingly used because of low pollutant emissions, and these pollutant emissions vary depending on the excess air ratio (λ).
Especially in Europe, various kinds of gas are used. A first gas having a low calorific value such as city gas and a density lower than air, a second gas having a higher calorific value such as natural gas and a density lower than air, It can be classified as a third gas having a higher calorific value than butane and a density higher than that of air.
Since the various types of gases have different heating values, the amount of air to be mixed must be varied corresponding to the type of each gas.
Since the supply amount of the gas is determined by the pneumatic gas control valve in the case of the conventional pre-mixed burner, if the gas type is changed to the second gas or the third gas when the opening amount is set in correspondence with the first gas to the pneumatic gas control valve , There is a problem that the excess air ratio (?) Is changed and a large amount of contaminants are discharged.
To solve these problems, PCT International Publication WO 2014/060991 "APPARATUS FOR CONTROLLING AND ADJUSTING THE COMBUSTION IN A FUEL GAS BURNER"
The PCT International Publication WO 2014/060991 discloses an apparatus for measuring the temperature of a burner, comprising a temperature sensor for measuring a burner surface temperature, a card for receiving temperature information measured by the temperature sensor, a valve for controlling a supply amount of the gas corresponding to the temperature information, .
In this case, the temperature sensor is designed to measure the surface temperature of the burner. When the gas boiler is reactivated for a long time, it should be based on the measured temperature of the burner after a certain time has elapsed.
If the burner surface temperature takes a long time to rise, there is a problem that pollutants such as nitrogen oxides are discharged in a large amount until the optimum air fuel mixture ratio is controlled.
Further, in the case of changing the gas type in which the gas heating value is rapidly changed, the incomplete combustion is rapidly generated due to the fact that the flame temperature change is not recognized quickly, resulting in a problem of excessive CO emission and noise generation and damage to the heat exchanger there was.
In addition, since the pneumatic gas control valve must be controlled in accordance with the specifications of the gas boiler in order to limit the maximum amount of gas supplied during the manufacturing process of the product, the process is complicated in the production of the product.
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a combustion device and a control method for rapidly varying a state of a flame and controlling an excess air ratio, thereby measuring a flame current, The purpose is to provide.
It is another object of the present invention to reduce the manufacturing process time by eliminating the need to adjust the opening amount of the pneumatic gas control valve in the production of the gas boiler.
In order to achieve the above object, the present invention provides a combustion apparatus having a flame rod for measuring flame current, comprising: a burner; A blower for supplying air to the burner; A gas supply unit for supplying gas to the burner together with the air; A flame rod for measuring a current of the flame generated in the burner; And comparing the detected current value detected by the flame load with a preset reference current value to change a gas supply amount in the gas supply unit when the detected current value deviates from the deviation of the reference current value, And outputting a control signal so as to be within a deviation range of the current value.
The gas supply unit includes an electronic gas control valve for regulating a supply amount of the gas in response to a control signal of the control unit.
The gas supply unit may further include a pneumatic gas control valve having an opening of a predetermined size to allow the gas to flow due to a pressure difference generated by the blower.
The control unit judges the current load and compares the detected current value detected in the flame load with a reference current value corresponding to the current load.
And a rotational speed measuring sensor for measuring the rotational speed of the blower to determine the current load.
A control method of a combustion apparatus having a flame rod for measuring a flame current according to the present invention comprises the steps of: a) operating a burner to perform combustion; b) measuring the detected current value of the flame generated in the burner using the flame load; c) comparing the detected current value measured from the flame load with a reference current value of a predetermined flame to the control unit to determine whether the detected current value deviates from the deviation range of the reference current value; d) if the detected current value deviates from the deviation range of the reference current value as a result of the determination in the step c), the control unit controls the electronic gas control valve provided in the gas supply unit so that the detected current value is within a deviation range of the reference current value And adjusting the supply amount of the gas so as to be as small as possible.
Wherein the control unit is provided with a flame current correction function so as to be performed every predetermined period of time and the flame current correction function performs combustion while varying the excess air ratio to change the tendency of the detected current value of the flame according to the excess air ratio, The reference current value is shifted so that the inflection point of the detected current value becomes the inflection point of the new reference current value.
In the step c), the control unit first determines the current load, and determines whether the detected current value is within a deviation range of the reference current value suitable for the current load.
According to the combustion apparatus and the control method provided with the flame rod for measuring the flame current of the present invention, the flame current is measured using the flame rod for sensing the current of the flame, By quickly sensing and controlling the excess air ratio (?), Pollutant emissions can be minimized, noise can be reduced and damage to the heat exchanger can be prevented.
In addition, since the gas supply amount can be controlled in the electronic gas control valve, it is not necessary to adjust the opening amount of the pneumatic gas control valve in the production of the gas boiler, thereby shortening the manufacturing process time.
In addition, by performing the flame current correction every predetermined period, it is possible to maintain a constant excess air ratio (?) Even when the position of the flame rod is displaced or foreign matter is piled on the flame rod.
1 is a view showing the configuration of a combustion apparatus according to the present invention;
2 is a graph showing a current value of a flame with respect to an excess air ratio
Fig. 3 is a graph showing the current value of the flame with respect to the excess air ratio for each load when the loads are different from each other
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a view showing a configuration of a combustion apparatus according to the present invention, and FIG. 2 is a graph showing a current value of a flame with respect to an excess air ratio.
1, there are shown a
The
The
The
The pneumatic
When the gas boiler is stopped, the gas cylinder and the hole are closed to block the supply of gas. When the gas boiler is stopped, the gas cylinder and the hole are opened to supply the gas. (On) / Off (Off) control is performed by the
The electronic
The
Using this principle, the
The
The
Referring to FIG. 2, the detected current value of the flame increases as the excess air ratio λ increases until the excess air ratio λ becomes approximately 1. However, since the excess air ratio λ becomes 1 or more, the excess air ratio λ The detection current value of the flame is decreased.
The flame current generated from the flame becomes smaller as the excess air ratio λ is increased. When the type of gas is changed in the same load, the excess air ratio λ is also changed due to the difference in the calorific value. When the type of the gas is changed by measuring the flame current in the
Among gases, a gas with a high calorific value has a low excess air ratio (?) Due to a low concentration of oxygen contained in the combustion gas, and a gas with a low caloric value has a high excess air ratio? Because of the high concentration of oxygen contained in the combustion gas.
If the gas is changed to a gas having a high calorific value at the same load, the excess air ratio (?) Becomes small, so that the current value of the flame detected by the flame load (400) becomes large. In this case, when the
If the gas is changed to a gas having a low calorific value under the same load, the excess air ratio (?) Becomes large, so that the detection current value of the flame detected by the flame load (400) becomes small. In this case, if the detected current value of the flame is smaller than the predetermined reference current value, the
When the current value of the flame is measured using the
In the prior art, the process of setting the opening amount of the pneumatic type
On the other hand, the combustion apparatus of the present invention is equipped with a flame current correction function.
The
As described above, whether or not the detected current value of the flame agrees with the originally set reference current value can be checked every predetermined period to perform correction.
A normal reference current value set as a reference in FIG. 2 is indicated by a solid line, and a dotted line shifted upward from the solid line indicates that the end position of the
A method of checking the current flame current value will now be described. The
When the inflection point is found to be higher than the normal inflection point (point A in FIG. 2), the reference current value set in the
When the inflection point is found to be lower than the normal inflection point (point B in FIG. 2), the reference current value set in the
If the flame current correction is performed periodically at regular intervals, it is possible to maintain a constant excess air ratio (?) Even when the mounting position of the
3 is a graph showing the current value of the flame with respect to the excess air ratio for each load when the loads are different from each other.
In FIG. 2, the relationship between the excess air ratio (?) And the current value of the flame is described in the case where the load is the same. However, when the load variation occurs, the excess air ratio (?) And the current value of the flame are also varied. The relationship between the excess air ratio and the current value of the flame for different loads will be described.
FIG. 3 is a graph showing the relationship between the excess air ratio (?) And the current value of the flame when the load is 20%, 50%, and 100%.
When the excess air ratio (λ) is the same, the current value of the flame increases as the load increases. When the load is the same, the current value of the flame decreases as the excess air ratio (λ) increases.
Therefore, the characteristic of the flame current value differs according to the excess air ratio [lambda] for each load condition. Therefore, whether or not the detected current value of the flame measured through the
In this case, the load is related to the rotation speed (RPM) of the
As described above, the present invention is not limited to the above-described embodiments, and various changes and modifications may be made without departing from the scope of the present invention as defined in the appended claims. And such modifications are within the scope of the present invention.
100: burner 110: ignition device
200: blower 300: gas supply part
310: Pneumatic gas control valve 320: Electronic gas control valve
400: Flame load 500:
Claims (8)
A blower for supplying air to the burner;
A gas supply unit for supplying gas to the burner together with the air;
A flame rod for measuring a current of the flame generated in the burner;
And comparing the detected current value detected by the flame load with a preset reference current value to change a gas supply amount in the gas supply unit when the detected current value deviates from the deviation of the reference current value, A control unit for outputting a control signal so as to be within a deviation range of the current value;
And a flame rod for measuring a flame current.
Wherein the gas supply unit includes an electronic gas control valve for controlling a supply amount of gas in response to a control signal of the control unit.
Wherein the gas supply unit further comprises a pneumatic gas control valve having an opening of a predetermined size to allow gas to flow in due to a pressure difference generated by the blower.
Wherein the control unit judges a current load and compares a detected current value detected in the flame load with a reference current value corresponding to the current load.
And a rotational speed measuring sensor for measuring the rotational speed of the blower to determine the current load.
b) measuring the detected current value of the flame generated in the burner using the flame load;
c) comparing the detected current value measured from the flame load with a reference current value of a predetermined flame to the control unit to determine whether the detected current value deviates from the deviation range of the reference current value;
d) if the detected current value deviates from the deviation range of the reference current value as a result of the determination in the step c), the control unit controls the electronic gas control valve provided in the gas supply unit so that the detected current value is within a deviation range of the reference current value Adjusting the supply amount of the gas so that the gas is supplied;
A control method of a combustion device provided with a flame rod for measuring a flame current composed of
Wherein the control unit is provided with a flame current correction function so as to be performed every predetermined period of time and the flame current correction function performs combustion while varying the excess air ratio to change the tendency of the detected current value of the flame according to the excess air ratio, The reference current value is shifted so that the inflection point of the detected current value becomes the inflection point of the new reference current value.
Wherein the controller determines first whether the current load is a current load and whether the detected current value is within a deviation range of a reference current value suitable for a current load, Method for controlling a combustion device with a flame rod
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KR1020140106776A KR20160021496A (en) | 2014-08-18 | 2014-08-18 | Combustion apparatus having flame rod measuring flame current |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR20190060236A (en) * | 2017-11-24 | 2019-06-03 | 주식회사 경동나비엔 | Combustion apparatus capable of flame measurement and the method thereof |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR20190060236A (en) * | 2017-11-24 | 2019-06-03 | 주식회사 경동나비엔 | Combustion apparatus capable of flame measurement and the method thereof |
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